Jinu

Adding more notes For example, if typing out a LINQ statement starting Array.Empty().Select( and pressing tab, define a skeleton lambda expression for the Func argument

cc @sharwell for info

Remove unused references only work with SDK-style projects currently

cc @genlu fyi

**Design Meeting Notes** Seems like a good idea, We should not collapse the case value itself, but anything under its body should be collapsible. also see related issue https://github.com/dotnet/roslyn/issues/35792

cc @tmat